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It would be nice if there was a brief time (couple of seconds) that systems (HVAC, sound system, etc.) would stay on inside the car after driver leaves and closes door allowing the passenger to choose to "leave on" without everything going off, then having to be turned on again.

Just tested this in my garage, you can just put it in park, walk out with the fob and then the passenger can touch the screen then everything resumes.

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So which is it? caddio says that the alarm will go off if you take the fob with you but is that only if the passenger doesn't touch the screen? I suppose if I leave my (nearly teenage) kids in the back seat they would have to reach up and touch the screen or the alarm would go off?

If I leave the fob in the car but leave the car (butt sensor deactivates) does the car remain on?

But the question is, did she touch the screen when you left so the car was still running heater/stereo?
Otherwise car lock itself and then you'll have alarm going off

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you need to touch the screen before you exit if the car has auto locks when you walk away turned on.
best way is to park the car with the e-brake button on the touch screen if you really want it to stay on. otherwise the screen touch to stay on method times out after a while.
e-brake will leave radio on even if you exit the car and close everything. this is what I do if to wash my car with the stereo playing

Pro tip (which I have never seen mentioned on this forum)
If you are a passenger and driver leaves, and you forget to press the screen in time (I think thirty seconds? There's a subtle clicking sound once you've missed the window) Then press your hand on the drivers seat, it takes a bit of force but is quite easy to do. You're basically fooling the car into thinking the driver sat back down.

As for the car alarm, I'm still experimenting with when/why this happens. (Assume driver is gone, you don't have the key but the screen is on) - I suspect you're okay if you unlock the car from the screen first before you try the door but not sure.

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